26 
Journal of Agricultural Research 
Vol. I, No. i 
Lamb No. 9.—A check animal, not fed with tapeworm segments. 
October 18. Chloroformed. In poor flesh. Free from parasites except Oesopha- 
gosiomum nodules on the intestines. 
The following experiments relating to the possibility of the develop¬ 
ment of sheep-measle tapeworms in man have been caried out, the writer 
being the subject. 
On March 6, 1913, a cysticercus about 5 mm. in diameter, and March 14 another 
cysticercus of similar size, both from sheep hearts, were swallowed. Both cysticerci 
were alive and in good condition, exhibiting lively contractions of the caudal bladder 
when viewed under the microscope. On March 28 eight fully developed cysticerci 
were isolated from a sheep carcass heavily infested with Cysticercus ovis and swallowed. 
These cysticerci were apparently in good condition and were undoubtedly alive, 
as they showed active movements under the microscope. No signs of tapeworm 
infestation have appeared in the case of the writer. 
SUMMARY OF LIFE-HISTORY EXPERIMENTS 
Five dogs were each fed from 21 to 26 muscle cysticerci from sheep on 
various dates between March 25 and May 24. Subsequent to June 11, 
tapeworm eggs or segments were demonstrated in the feces, or tape¬ 
worms were found post-mortem in the case of all five dogs. No tape¬ 
worms were found in one of the dogs (No. 5) post-mortem, but a month 
earlier this dog had shown tapeworm eggs and segments in the feces. 
In the case of two of the dogs (Nos. 5 and 6) it was evident that the tape¬ 
worms had reached egg-producing maturity within seven weeks, as the 
earliest feeding of cysticerci was on April 23, eggs being demonstrated 
in the feces on June 11. The number of tapeworms recovered varied 
from 7 to 16. 
Two dogs were fed Cysticercus tenuicollis , 18 and 21 cysticerci, respec¬ 
tively, between April 5 and May 28. The first tapeworm eggs were found 
in the feces on June 22. On post-mortem examination 9 tapeworms 
were found in one dog and 10 in the other. 
Six lambs (Nos. 1 to 6) were fed with gravid segments of tapeworms 
from the dogs which had been fed Cysticercus ovis , two (Nos. 7 and 8) 
with gravid segments of tapeworms from one of the dogs which had been 
fed C. tenuicollis , and one (No. 9) was retained under the same conditions 
as the others but without receiving any cysticerci. Lambs Nos. 1 to 6 
received yi to 10 segments, and lambs Nos. 7 and 8, 1 and 10 segments, 
respectively. Of the former all but the one receiving half a segment died 
in 13 to 23 days after feeding, the one receiving 10 segments being the 
first to die, followed by one receiving 1 segment (death in 18 days), then 
by one receiving 3 segments (death in 19 days), then by two more receiving 
1 segment each (death in 22 and 23 days, respectively), leaving the lamb 
which received half a segment to survive until killed—83 days after feed¬ 
ing. Both of the lambs fed with segments of Taenia hydatigena (adults 
